Tawse‐Smith 2002

Methods	Randomised, cross‐over study. Patients cannot be blind, outcome assessor blind. 4 withdrawals.
Participants	Patients age range 55 to 80. Non smokers. Mandibular supported overdenture. 40 enrolled and results given for 36.
Interventions	2 groups. Powered (Braun Oral Plaque Remover 3‐D) versus manual toothbrushing (Oral B Squish grip) twice a day for 30 seconds. Maintenance every 6 weeks. Study duration: 6 weeks.
Outcomes	Modified plaque index by Mombelli and modified sulcus bleeding index by Mombelli at 6 weeks.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	"A total of 40 participants were randomly selected from the list of patients treated with implant‐supported mandibular overdentures". Answer from the author: "Computer generated random numbers"
Allocation concealment (selection bias)	Unclear risk	Answer from the Author: "Sealed enveloped", but not specified when they were opened.
Blinding (performance bias and detection bias) All outcomes	Low risk	"Throughout this investigation the examiners remained blinded as to the brush type used by the subject".
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	4 losses to follow‐up.
Selective reporting (reporting bias)	Low risk	Answer from the author: "All the data recorded at protocol stage were accounted for".
Other bias	Unclear risk	Commercially supported (Braun Oral‐B; Nobel Biocare, Southern Implants).
Blinding of the patient?	Low risk	Not possible. This was judged to be irrelevant for the risk assessment.